But in a statement to the BBC, spokeswoman Amanda Miller said: "After much consideration, it was mutually determined that it would be more cost effective and logistically practical for the Secret Service to lease space elsewhere."

Secret Service spokeswoman Catherine Milhoan told the BBC it was continuing the search "to obtain permanent work space in an appropriate location".

Mr Trump has not visited the tower since his inauguration, but his two adult sons, Eric and Donald Jr, often work there.

Security analysts say the Secret Service's relocation to a trailer outside could hamper radio transmissions between agents and the president's family inside the building.

GSA spokeswoman Pamela Dixon told the BBC the agency does "not comment on projects in active procurement" and directed further questions to the Secret Service.

The Pentagon is renting a 3,475 sq ft unit there for $130,000 a month, but it is reported to be privately owned so the Trump Organization will not profit.